Trackball mice, and choosing between thumb, finger and vertical

A trackball is the one desk accessory where the specification sheet tells you almost nothing useful. DPI, polling rate and RGB are all beside the point. The question is where your hand sits and which finger moves the ball, because that decides whether you adapt to it in a week or give up in three days.

There are three shapes, and they suit different people.

Thumb trackball

The ball sits on the left side of the body, under your thumb. Your hand rests on the shell exactly as it would on an ordinary mouse, and the buttons stay under the fingers you already use.

This is the one to buy first. The transition from a normal mouse is the smallest of the three, because everything except pointer movement stays where your hand expects it. Most people are productive again within a couple of days.

The limit is precision. Your thumb is strong but not delicate, and the ball is small, so fine work like photo masking or CAD stays awkward.

Buy this if: you are switching from a normal mouse, you mostly work in a browser and an office suite, or you want the lowest chance of giving up.

Index finger trackball

The ball sits on top, in the middle, and you move it with your index and middle fingers. The ball is usually much larger.

Two fingers on a big ball gives you far more control than a thumb on a small one, and it is the shape serious trackball users tend to settle on. It is also the harder switch, because your clicking fingers are now your pointing fingers, and the buttons move to the sides where your thumb and little finger take over.

Give this one two weeks before deciding. Most people who quit early quit in the first three days, which is exactly when it feels worst.

Buy this if: you want maximum precision, you have used a trackball before, or you are prepared to be slower for a fortnight to be faster afterwards.

Vertical trackball

The whole body is tilted so your hand sits in a handshake position rather than palm down. The ball is usually thumb operated.

The reason to buy this is not the ball, it is the angle. Palm down means your forearm bones are crossed all day. A vertical grip keeps them parallel, which is the same reasoning behind vertical mice. If your discomfort is in the wrist or forearm rather than the fingers, this addresses the actual cause.

It takes up more desk depth than it looks like it will.

Buy this if: wrist or forearm strain is the reason you are shopping.

What actually matters when comparing listings

Bearings, if the listing says. The ball rests on three small support points. Ceramic or steel bearings roll smoothly for years. Plastic pegs, which is what the cheapest units use, get sticky within months as skin oil builds up. The listing will rarely state it, but a unit that comes with spare bearings almost certainly has good ones.

Ball size. Anything around 34mm is a thumb ball. Around 44mm is an index finger ball. If the listing photo shows a large ball on a body shaped like a normal mouse, look closer, because one of the two is wrong.

Connection. Most of these offer both a 2.4GHz dongle and Bluetooth. Bluetooth is convenient and saves a USB port, but it wakes from sleep more slowly. If you switch between two machines regularly, one dongle plus one Bluetooth pairing is genuinely useful. If you use one computer, the dongle is the better connection.

Rechargeable or AA. Built in batteries mean no battery drawer, but the cell is the part that dies first and it is rarely replaceable. A trackball is a device you might keep for five years. Worth thinking about.

What to expect from the cheaper end

The bodies on AliExpress trackballs are often the same moulding sold under several names. That is not a problem in itself, because the shell is the part least likely to go wrong. What varies between sellers on the same moulding is the sensor, the bearings and the switches.

The most common complaint on this category is the ball becoming sticky, which is almost always dirt on the bearings rather than a fault. Pop the ball out, wipe the three support points with a dry cloth, and it rolls freely again. Doing that once a month is normal ownership, not a defect.

Getting used to it

Two things make the first week much easier.

Lower the pointer speed for the first few days, then raise it once your hand stops overshooting. Most people set it too high on day one, decide the trackball is imprecise, and stop.

Keep your old mouse plugged in but out of reach. Reaching for it defeats the adjustment, but knowing it is there stops the first frustrating hour from ending the experiment.

What I would actually do

• Never used one: thumb trackball. Smallest change, highest chance you keep using it.
• Wrist or forearm pain: vertical. The angle is the point.
• You already know you like trackballs: index finger, large ball.
• Buying for someone else: thumb trackball, and only if they have said they want one. This is not a good surprise gift.

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This is a buying guide built from what the listings publish and from prices I read and date myself. I have not used any of the trackballs listed. When I buy and use one, this page becomes a hands-on review with my own photographs and it will say so at the top.